Method and device for analyzing small particles in gas

摘要

A method for detecting decalibration of a device for analyzing particles, including irradiating particles with light, detecting light scattered from the particles, amplifying, digitizing and detecting the electric signal obtained in a plurality of digital channels corresponding to the intensity representing the particle size and monitoring the appearance of the Mie peak in the measured size-dependent frequency distribution and sending a report if the Mie peak deviates in a digital channel other than the digital standard channel belonging to it based on measurement settings. The electronic analyzing unit detecting a Mie peak in the measured particle size distribution and assigning it to a digital detection channel in a device for detecting the concentration of small particles in gas, with a sample tube, a light source, a detector detecting scattered light scattered on the particles, an analog amplifier, an analog-digital converter, an electronic analyzing unit and a display and operating unit.

主权项

1. A method for analyzing small particles in gas, the method comprising:
irradiating particles with light; detecting light scattered by the particles; amplifying, digitizing and detecting an electric signal in a plurality of digital channels as a measured size-dependent frequency distribution corresponding to an intensity representing a particle size of said particles, said electric signal being obtained based on detection of said light scattered by said particles; monitoring an appearance of a peak or flattening in a flank of said measured size-dependent frequency distribution and providing a report if said peak appears in one or more digital channels other than at least one standard channel belonging to said peak based on measurement settings in order to provide a recalibration, wherein the peak or flattening of said flank of said measured size-dependent frequency distribution is different from a maximum of said measured size-dependent frequency distribution.